Study on Molecular Dynamics of the Adsorption and Film Formation of Octadecylamine on Carbon Steel Surface

被引：0
|
作者：
Li C. [1 ]
Huang J. [1 ]
Wang L. [2 ]
Zhou K. [1 ]
机构：
[1] Key Laboratory of Energy Thermal Conversion and Control, the Ministry of Education, Southeast University, Nanjing
[2] East China Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group, Shanghai
来源：
Hedongli Gongcheng/Nuclear Power Engineering | 2023年 / 44卷 / 02期
关键词：
Corrosion inhibition film; Molecular dynamics (MD) simulation; Octadecylamine (ODA); P280GH carbon steel; Steam generator (SG);
D O I：
10.13832/j.jnpe.2023.02.0203
中图分类号：
学科分类号：
摘要：
P280GH carbon steel pipe is widely used in the main feedwater system of Hualong One unit, and octadecylamine (ODA) is applied to form a corrosion inhibition film by adsorption on the inner wall of the pipe. ODA can effectively inhibit corrosion and avoid pipe failure and serious scaling of steam generator (SG). However, the mechanism of adsorption and film formation of ODA on carbon steel surface is still unclear, which seriously restricts the performance optimization, optimization and application of ODA. In order to solve this problem, molecular dynamics (MD) simulation method is used to carry out the study. The results show that the nitrogen atoms at the head of the ODA molecule form coordination bonds with the iron atoms on the carbon steel surface, which promotes the adsorption and anchoring of the ODA molecule. The microscopic configuration of the corrosion inhibition film formed is dependent on the concentration of ODA. At low concentration, the corrosion inhibition film has a poorly interwoven single-layer configuration between ODA molecular tail chains, and as the concentration increases, the corrosion inhibition film evolves into a tightly interwoven complex bilayer configuration between ODA molecular tail chains. After the concentration of ODA exceeds a certain threshold, the configuration of the corrosion inhibition film no longer changes significantly, and the ODA molecules that are not adsorbed to form the film eventually accumulate to form colloidal micelles. © 2023 Yuan Zi Neng Chuban She. All rights reserved.
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页码：203 / 209
页数：6
相关论文
共 22 条
  • [1] RODRIGUEZ M A., Corrosion control of nuclear steam generators under normal operation and plant-outage conditions: a review, Corrosion Reviews, 38, 3, pp. 195-230, (2020)
  • [2] 40, 1, pp. 101-104, (2019)
  • [3] ATTA A M, EL-MAHDY G A, ALLOHEDAN H A, Et al., Adsorption characteristics and corrosion inhibition efficiency of ethoxylated octadecylamine ionic liquid in aqueous acid solution, International Journal of Electrochemical Science, 11, 2, pp. 882-898, (2016)
  • [4] JAPPINEN E, IKALAINEN T, JARVIMAKI S, Et al., Corrosion behavior of carbon steel coated with octadecylamine in the secondary circuit of a pressurized water reactor, Journal of Materials Engineering and Performance, 26, 12, pp. 6037-6046, (2017)
  • [5] BENITEZ J J, SALMERON M., Kinetic effects in the self-assembly of pure and mixed tetradecyl and octadecylamine molecules on mica, Surface Science, 600, 6, pp. 1326-1330, (2006)
  • [6] Pressurized Water Reactor (PWR)/Pressurized Heavy Water Reactor (PHWR) Secondary Side Filming Product (FP) Application: technical assessment program development, candidate FP status, and recommended compatibility testing: 3002015894, (2019)
  • [7] ODAR S., Use of film forming amines (FFA) in nuclear power plants for lay-up and power operation, (2017)
  • [8] BETOVA I, BOJINOV M, SAARIO T., Film-forming amines in steam/water cycles: structure, properties, and influence on corrosion and deposition processes: VTT-R-03234-14, pp. 1-41, (2014)
  • [9] GENXIAN L, YUN S, CANSHUAI L, Et al., Adsorption behaviour of film-forming amine on pre-oxidized carbon steel surface, Nuclear Engineering and Technology, 54, 4, pp. 1185-1194, (2022)
  • [10] LIU C S, LIN G X, SUN Y, Et al., Effect of octadecylamine concentration on adsorption on carbon steel surface, Nuclear Engineering and Technology, 52, 10, pp. 2394-2401, (2020)
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